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In testing the difference between the means of two normally distributed populations using large, independent random samples with known variances, the correct test statistic to use is?

When testing a hypothesis about the mean of a population of paired differences in which two different obersvations are taken on the same units, the correct test statistic to use is?

In testing the difference between two means from two normally distributed independent populations, the distribution of the difference in sample means will be?

In testing the difference between the means of two normally distributed populations, is m1=m2=50, n1=9, n2=13, the degrees of freedom for the t-statistic is?

When comparing two independent population variances, the correct test statistic to use is?

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